Abstract
The bond behavior of prestressing strands is of great importance for the capacity of precast prestressed concrete structures. In the present study, the bond behavior of three-wire strands, and some influencing parameters, were examined by means of steel encased pull-through and push-in tests. The three mechanisms: adhesion, friction and other mechanical actions were found to be present at the strand-concrete interface at different slip values. The results from the experiments showed that the micro roughness of the strand surface strongly affected the initial bond response of the strand, that is the adhesion in the interface. The maximum bond capacity of indented three-wire strands was found to be directly connected to the geometric properties of the strand indents. The influence of the concrete strength on the bond capacity of the strand was hard to interpret. However, the density of the concrete matrix was found to be a better parameter for determine the influence of the concrete rather than the compressive strength.
Résumé
Le comportement de la liaison dans les câbles de précontrainte est d'une grande importance pour la capacité des structures préfabriquées de béton précontraint. La présente étude examine, au moyen d'essais encastrés dans l'acier de tirage et de poussage, le comportement des liaisons de câbles à trois fils et certains paramètres d'impact. Les trois mécanismes: adhésion, friction et autres actions mécaniques sont découverts dans l'interface câble-béton à différentes gammes de glissement. Les résultats des expériences montrent que la microrugosité de la surface du câble affecte fortement la réponse de la liaison initiale du câble, c'est-à-dire l'adhésion de l'interface. Il s'avère que la capacité maximale de la liaison des câbles à trois fils poinçonnés est directement liée à la géométrie des poinçonnages du câble. L'impact de la force du béton sur la capacité de la liaison du câble est d'interprétation difficile. Cependant, la densité de l'agglomérant de béton s'est avérée constituer un meilleur paramètre que la force compressive pour déterminer l'impact du béton.
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Gustavson, R. Experimental studies of the bond response of three-wire strands and some influencing parameters. Mat. Struct. 37, 96–106 (2004). https://doi.org/10.1007/BF02486605
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DOI: https://doi.org/10.1007/BF02486605